[GHC] #9515: Deprecate -XExplicitForAll

[GHC]

#9515: Deprecate -XExplicitForAll
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              Reporter:  dfeuer      |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.8.3
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 Good idea. So far as I can see the '''sole''' effect of `-XExplicitForAll`
 is to enable the `forall` keyword.  It's implied by `RankNTypes`,
 `ScopedTypeVariables`, `LiberalTypeSynonyms`, `ExistentialQuantification`.

 I'm all for deprecating it as a flag in its own right. Does anyone want to
 offer a patch? Need to update the user manual too, and get rid of uses of
 it in the GHC tree itself.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9515#comment:1>
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